Λ polarization from vortex rings as the medium response for jet thermalization
[1];
[4];
[1];
- Universidade Estadual de Campinas (Brazil)
- Ohio State University, Columbus, OH (United States)
- Universidade de São Paulo (Brazil); University of Illinois at Urbana-Champaign, IL (United States)
- Wayne State University, Detroit, MI (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
We performed a systematic study on the formation of vorticity rings as the process for jet thermalization in the medium created in high-energy nuclear collisions. In this work, we expanded our previous analysis to a more realistic framework by considering noncentral events and fluctuations in the initial condition. We simulate the formation and evolution of the flow vortex structure in a relativistic viscous hydrodynamic model and study the sensitivity of the proposed “ring observable” (ℛ$$^{𝑡}_{Λ}$$) that can be measured experimentally through the polarization of Λ hyperons. We show that this observable is robust with respect to fluctuating initial conditions to capture the jet-induced vortex flow signal and further study its dependence on different model parameters, such as the jet's velocity, position, the fluid's shear viscosity, and the collision centrality. The proposed observable is associated with the formation of vorticity in a quark-gluon plasma, showing that the measurement of particle polarization can be a powerful tool to probe different properties of jet-medium interactions and to understand better the polarization induced by the transverse and longitudinal expansions of the medium.
- Research Organization:
- The Ohio State University, Columbus, OH (United States); Wayne State Univ., Detroit, MI (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0020651; SC0021969
- OSTI ID:
- 2281635
- Journal Information:
- Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 109; ISSN 2469-9985; ISSN 2469-9993
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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